Hi Hmarts,
From the description, it seems you are not able to use these applications after trying to update them to the latest version.
Based on my analysis, the issue seems to be a client issue about the Office for iPad (Excel, Word, PPT). Since this forum focuses on Office 365 for Business plan related issues, we have limited resources about the usage of the Office applications. To ensure you get the dedicated support, I suggest you post the question in the Office application forum for further assistance The support engineers who are specialized in that area in that forum will assist you further. We sincerely appreciate your understanding.
Meanwhile, based on my experience, it may be stuck at the updating process, if it is convenient, you may try to uninstall and reinstall these applications to check if the issue persists.
And any community members who are experienced on this area are also welcome to share your insights in this thread.
Regards,
Charles